17. 선생님 퀴즈

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    int N = 0;
    
    scanf("%d", &N);
    
    for (int i = 0; i < N; i++) {
        int card = 0, result = 0, originRes = 0;
        
        scanf("%d %d", &card, &result);
        
        for (int i = 1; i <= card; i++) {
            originRes += i;
        }
        
        if (originRes == result) {
            printf("YES\n");
        } else {
            printf("NO\n");
        }
    }
    
    return 0;
}